338 



THE GEOLOGIST. 



and a-lialf inclies broad, the snb-candal about five and a-lialf inclies 

 long by seven and tliree-quarters inclies broad. By comparing 

 tbis with the Carmyllie specimen, it mnst have belonged to an 

 animal about six feet in length. 



From the same quarry, and about the same time, I was also for- 

 tunate enough to procure five very nearly complete segments and 

 part of a sixth of another Pterygotus anglicus, the segments of which 

 lift quite out from the matrix, leaving a very thin cast. A seventh 

 segment is also shown in this specimen, lying at nearly right angles 

 to the others ; this might, however, have belonged to another animal 

 coming out entire and sepa^rate from the other segments. This speci- 

 men would seem to have formed part of an animal considerably 

 broader in proportion to its length than the two before described : in 

 this respect it agrees with another very fine specimen now in the 

 museum of the Watt Institution of Dundee, found some two years 

 ago in a quarry on Tealing, consisting of seven of the body segments 

 of the Pterygotus anglicus. 



These four are by far the most complete remains of this very 

 curious crustacean yet found ; besides those of this species, P. angli- 

 cus, only very fragmentary remains of another species of Pterygotus, 

 P. ]junctatus, have yet been found in Forfarshire. In Cauterland 

 Den, however, and the " fish-beds" near Farnell, several specimens of 

 a Pterygotus very similar in appearance and form to the P. anglicus 

 have been discovered, but of a comparatively very small size, being 

 only six to ten inches in length. These have not as yet been ex- 

 amined and named by any competent authority. They are all pre- 

 served in the collections of the Rev. Henry Brewster, of Farnell, and 

 the Rev. Hugh Mitchell, of Craig. 



After the repeated notices of the Farnell " fish-bed" in the " Geo- 

 logist," by Mr. Mitchell, it is unnecessary for me to give any length- 

 ened description of this very curious deposit or its peculiar fossils. 

 It was first noticed as affording evidences of being fossiliferous, and 

 pointed out as such by Mr. Brewster. It is, however, to the indefati- 

 gable researches of Mr. Mitchell that we are indebted for a kuoAv- 

 ledge of the curious organisms it contains. It is at present being- 

 very fully explored. The Earl of Southesk, on whose estates it is 

 situated, has not only allowed this to be done, but has, ^vith the 

 greatest liberality, furnished labourers for the heavy part of the 

 work, placing the examination of its treasures in the hands of Mr. 

 Brewster and myself; and it is only due to his lordship here to 

 record our grateful thanks for the unexampled facilities it has 

 afforded for ha^dng these treasures, so long locked up, made known 

 to the geological world. 



Besides a good many specimens of the genera Acantliodes and 

 Bmchy acanthus, discovered and noticed by Mr. Mitchell, several 

 species, apparently new, of Piplacantlius, Avith the remams of other 

 fishes of other genera have already been discovered, as also several 

 curious and seemingly new species, if not genera, of Euryptcridce 

 and other crustaceans. These are in the course of being prepared for 



